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I'm going to show you how to use particles for weather, replacing func_precipitation.
Posted by tfrepl on Sep 4th, 2011
Intermediate Level Design/Theory.
Particles are better then "brush weather" because:
So, tfrepl, how do you add particle weather? Is it hard?
Let me answer that question with an answer:
1. Create an info_particle_system about 512 units above the floor/structure/building (experiment with the height for better results).
2. Edit the following in your info_particle_system:
Particle System Name: env_rain_001 (for rain) or env_snow_light_001 (for snow).
Start Active?: Yes
Flag as Weather?: Yes
Notes: Flag as Weather is used to remove the particles if the user has chosen to remove weather.
Particle System Name: there could be other options (showed bellow).
The more info_particle_system's you add the more dense the weather will be.
You might want to add func_precipitation, to fill in the gaps.
3. You're done. Here's a comparsion and a list of weather effects.
Zoom in for better effect.
Some of the weather particles:
Hope this helped :) .